# Best notation for interval with scientific notation?

I am giving a value $$\alpha$$ and its confidence interval in a table. All numbers are very large so I ought to use scientific notation. But what is the best and neatest way to present this? Some options:

1. $$5\times10^6 (9\times10^5,9\times10^6)$$ - but does not conserve space
2. $$5\times10^6 (0.9,9)\times10^6$$
3. $$5 (0.9,9) \times10^6$$ - unclear that 10^6 applies to both items?
4. Use $$\alpha\times10^-6$$ as column title, and $$5 (0.9,9)$$ - but is minus sign confusing the fact that alpha is very big?
5. Use $$\alpha (10^6)$$ as column title, and $$5 (0.9,9)$$ - is this clear?
• I might write $(0.9;5;9)\times10^6$. Sometimes, tolerances are written $5^{+4}_{-4.1}$, which you can follow with $\times10^6$. $(\times10^6)$ in the column header will be understood as a factor to apply to the numerical values (and not to $\alpha$.)
– user65203
Feb 4 '19 at 12:48